SOLUTION: What Is the Reason for 2AB+BC=AB+BC+CD
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Question 29159: What Is the Reason for 2AB+BC=AB+BC+CD
Answer by checkley72(6) (Show Source): You can put this solution on YOUR website!
AB+AB+BC=AB+BC+CD
subtracting AB+CD from both sides leaves AB=CD
Therefore: AB = CD.
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